Hello
I am working on a project involving ABAQUS XFEM for stationary crack to obtain SIF and for crack propagation. However, I have encountered few problems. I have listed them below.
1. Simulation performed on stationary crack using classical method ( by defining collapsed elements around the crack tip and mentioning singularity) and xfem provide similar SIF
results, when compared, under the same loading and boundary conditions
However, the stress values near the crack tip differ by a larger extent in both these cases.
2. For crack propagation using XFEM, the following errors have been observed:
i) Too many attempts made for this increment
ii) Too many increments needed to complete the step
iii) The increment required is less than the minimum specified
Could anyone let me know if you have any suggestions to resolve the same.
Thank you for the answer.
However, could you explain this statement
"if your elements are fine with respect to load increments your tolerance of fracture criterion should be large enough"
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